PDP Configuration

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Table of Contents

Table of Contents
Chapter 1 PDP Overview............................................................................................................................... 1

1.1 Overview............................................................................................................................................1
1.2 PDP Configuration Tasks.................................................................................................................1

1.2.1 Default PDP Configuration.................................................................................................. 1
1.2.2 Setting the PDP Clock and Information Storage..............................................................1
1.2.3 Setting the PDP Version...................................................................................................... 2
1.2.4 Starting PDP on a Switch.................................................................................................... 2
1.2.5 Starting PDP on a Port.........................................................................................................2
1.2.6 PDP Monitoring and Management.....................................................................................2

1.3 PDP Configuration Example...........................................................................................................2

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PDP Configuration

Chapter 1 PDP Overview

1.1 Overview
PDP is specially used to discover network equipment, that is, it is used to find all
neighbors of a known device. Through PDP, the network management program can use
SNMP to query neighboring devices to acquire network topology.

Our company’s switches can discover the neighboring devices but they do not accept
SNMP queries. Therefore, switches only run at the edge of network, or they cannot
acquire a complete network topology.

PDP can be set on all SNAPs (e.g. Ethernet).

1.2 PDP Configuration Tasks
 Default PDP Configuration

 Setting the PDP Clock and Information Storage

 Setting the PDP Version

 Starting PDP on a Switch

 Starting PDP on a Port

 PDP Monitoring and Management

1.2.1 Default PDP Configuration

Purpose Default Settings

Global configuration mode This function is not enabled by default.

Interface configuration mode Enable

PDP clock (packet transmission 60 seconds
frequency)

PDP information storage 180 seconds

PDP version 2

1.2.2 Setting the PDP Clock and Information Storage

Setting the PDP Clock and Information Storage

Command Purpose

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PDP Configuration

pdp timer seconds Sets the transmission frequency of the PDP packets.

pdp holdtime seconds Sets the PDP information storage time.

1.2.3 Setting the PDP Version

To set the PDP version, you can run the following command in global configuration
mode.

Command Purpose

pdp version {1|2} Setts the PDP version.

1.2.4 Starting PDP on a Switch

To enable PDP, you can run the following commands in global configuration mode.

Command Purpose

pdp run Starts PDP on a switch.

1.2.5 Starting PDP on a Port

To enable PDP on a port by default, you can run the following command in port
configuration mode.

Command Purpose

pdp enable Starts PDP on a port of a switch.

1.2.6 PDP Monitoring and Management

To monitor the PDP, run the following commands in EXEC mode:

Command Purpose

show pdp traffic Displays the counts of received and
transmitted PDP packets.

show pdp neighbor [detail] Displays neighbors that PDP discovers.

1.3 PDP Configuration Example
Example 1: Starting PDP
Switch_config# pdp run
Switch_config# int g0/1
Switch_config_g0/1#pdp enable

Example 2: Setting the PDP clock and information storage
Switch_config#pdp timer 30
Switch_config#pdp holdtime 90

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PDP Configuration

Example 3: Setting the PDP version
Switch_config#pdp version 1

Example 4: Monitoring PDP

Switch_config#show pdp neighbor

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

S - Switch, H - Host, I - IGMP, r - Repeater

Device-ID Local-Intf Hldtme Port-ID Platform Capability

Switch Gig0/1 169 Gig0/1 COM, RISC R S

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